Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab96aa71c233f7f4a5f9e4aee15fa4f6e313ba6af7d5fe8c1d40015ebade45c' 
  AND token = 'KnyXk2kgvL29KJ1M98w6Su+Wf+7MNamI2ZDMd9BNQPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}